Always clear the mirror image data pointer
Always clear the mirror image data pointer

Under wayland evas will sometimes use the old one, I have no idea why.
Fixes a crash bug when mousing out of menus in a GTK app under wayland.

fix T3576

rvandegrift/e,tasn/enlightenment,tasn/enlightenment,rvandegrift/e,rvandegrift/e,tasn/enlightenment